Hall LANCAIR 4P N707SH

Summary

On 28 May 2001 at about 20:30 local time, a Hall LANCAIR 4P registered N707SH was involved in an accident near Bennett, Colorado, United States. 3 people were on board and 3 had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

28 May 2001 at 20:30

Classification

Accident

Location

Bennett, Colorado, United States

Coordinates

39.7507, -104.4205

Aircraft

Hall LANCAIR 4P

Registration

N707SH

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Watkins → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

DEN01LA103

3 people had minor injuries.

unsuitable terrain on which to make a forced landing. A contributing factor was a fatigue fracture of the starter adapter drive shaft, which resulted in a loss of engine power due to oil starvation.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

While in cruise flight, the oil pressure warning light illuminated, and the oil pressure gauge fluctuated between 0 and 10 psi. The engine made a loud noise and began to vibrate and lose power. A forced landing was made in an open field. After touch down, the left main and nose landing gear buckled, then the right main gear collapsed, shearing off the right wing. During the engine disassembly and inspection, it was discovered that the starter adapter drive shaft had fractured forward of the oil scavenge pump gears at a snap ring groove. This allowed pressurized lubricating oil to be discharged through the turbocharger turbine and compressor oil seals. Metallurgical examination concluded that the fracture was in fatigue and had initiated at multiple origins at the snap ring groove root fillet.

Quoted verbatim from the NTSB record.